A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 411
soln. of platinic nitrate and obtained on the platinum anode an ochre-yellow film,
soluble in hydrochloric and sulphurous acids, but insoluble in dil. nitric and sulphuric
acids. It has an acidic reaction towards litmus. The deposit is a basic platinic
nitrate. E. Koefoed reported platinic iiitrosyltetrarnrninohydronitrate, Pt(NHg)4-
(NO)(NO3)4:HNO3.
B. Gerdes obtained platinic hexamminonitrate, [Pt(NHg)6 ](N03)4, by the action
of nitric acid on the carbonate. The colourless needles are easily soluble in water.
I. I. Tscherniaeff and S. I. Chorunshenkoff studied the ionization constants.
A. Werner and A. Miolati measured the electrical conductivity of platinic dinitratotetramminonitrate,
[Pt(NHa)4(NOg)2I(NOa)2. W. Odling, C. Gerhardt, and
P. T. Cleve described platinic tetranitratodiammine, [Pt(NHg)2(NOg)4], prepared
by the action of an excess of nitric acid on the dihydroxydinitratodiammine.
The colourless or pale yellow powder consists of prisms, insoluble in cold water,
sparingly soluble in hot water, and freely soluble in water acidified with nitric
acid ; the salt crystallizes unchanged from a cooling, hot, aq.. soln. Warm hydrochloric
acid, and a boiling soln. of potassium chloride form the tetrachloride.
P. T. Cleve Obtained platinic trihydroxynitratodiammine, [Pt(NHg)2(OH)3(NO3)J,
by boiling a soln. of the cis-tetrachlorodiammine with silver nitrate ; and adding
alcohol to tne filtrate. The yellowish white, amorphous precipitate is soluble in
water. C. Gerhardt, W. Odling, T. Bergman, and P. T. Cleve described platinic
trans-dihydroxydinitratodiammine, [Pt(NHg)2(OH)2(NOg)2], prepared by the
action of ammonia on platinic nitrate ; and by boiling the tetrachlorodiammine
with silver nitrate. The yellowish-white powder, consisting of rhombic or hexagonal
plates, is sparingly soluble in cold water, and soluble in hot water. The aq. soln.
reddens litmus. Hydrochloric acid precipitates the tetrachloro-salt from a warm
soln. ; potassium dichromate gives a cinnabar-red precipitate. C. Gerhardt,
W. Odling, and O. Carlgren and P. T. Cleve described platinic dihydroxytetramminonitrate,
[Pt(NH3)4(OH)2](NOs)2, to be formed by boiling the hydroxynitratotetrammine
with ammonia ; by the action of hydrogen dioxide on platinous
tetramminonitratc ; and by the action of barium nitrate on the corresponding
sulphate. The white powder consists of rhombic plates. The salt detonates when
heated vigorously. The salt is sparingly soluble in cold water but more soluble in
hot water—O. Carlgren and P. T. Cleve said that 100 parts of cold water dissolve
0-29 part of salt, and boiling water 2*63 parts. A. Werner obtained no aquo-salt
by triturating it with nitric acid. C. Gerhardt said that sulphuric acid turns the dry
salt blue, and red nitrous fumes are evolved. The soln. gives white precipitates with
ammonium oxalate, sodium hydrophosphate, and sodium carbonate ; no precipitate
is formed with ammonium chloride ; and hydrochloric acid precipitates dichlorotetramminochloride.
C. Gerhardt, W. Odling, C. W. Blomstrand, and P. T. Cleve
described platinic hydroxyiiitratotetramminonitrate, [Pt(NH3)4(OH)(N03)l(N03)2,
prepared by warming platinous tetramminosulphate or nitrate with cone, nitric
acid ; by boiling platinic diiodotetramminonitrate with silver nitrate, or, according
to B. Gerdes, by the action of cold water on the dinitritotetramminonitrate. The
white crystals decompose with detonation when heated. The salt is sparingly
soluble in cold water, easily soluble in hot water, and less soluble in nitric acid.
Hydrochloric acid slowly forms dichlorotetramminonitrate • ammonium chloride
gives no precipitate ; cone, sulphuric acid forms sulphatotetramminosulphate ;
nitric acid gives a white precipitate ; neither potash lye nor aq. ammonia gives a
precipitate in sat. soln. ; aq. ammonia forms dihydroxytetramminonitrate ;
ammonium carbonate forms carbonatonitratotetramminocarbonate ; ammonium
oxalate gives a white precipitate ; sodium phosphate forms phosphatotetramminonitrate
; potassium dichromate forms dinitratotetramminedichromate ; potassium
chromate gives a yellow precipitate. P. T. Cleve prepared platinic dihydroxynitratotxiamminonitrate,
[Pt(NH3)3(OH)2(N03)]N03.H20, from silver nitrate and platinic
bromodinitratotriamminobromide. The white crystalline powder is soluble in
water. F. M. Jager studied the crystals of platinic trisetnylenediaminonitrate,